How can i install dropbox on my android?

You can simply use Dropbox on your android device. Use this link https://play.google.com/store/apps/details?id=com.dropbox.android&hl=en to install Dropbox on your device, and logging into the Dropbox account once it is installed. If you don't have an account with Dropbox then don't worry you will get an option to create a new one.